Valve-reseating tool



, 1. J. DONAHUE;

VALVE RESEATINQ TOOL. APPLICATION FILED OCT. 7, 1919.

1,366,639. Patented Jan. 25,1921.

INVENTOR Joan ig DoNHHUE,

J46. JW

ATTORNEY ilii'di'i'Egd PAT"? FFI'CE.

VALVE-RESEATTNG TOOL.

Application filed October "I, 1919.

To all whom it may concern Be it known that 1, JOHN J OSEPH DONA- r-rtrs, a citizen of the United States, residing at Centerville, in the county of Barnstable, State of Massachusetts, have invented a new and useful Valve-Reseating Tool; and I do hereby declare the following to be a full, clear, and exact description of the invention, such will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a valve grinding or reseating tool, one object of the invention being to provide a valve reseating tool erubodying novel features of construction whereby the tool is positively guided and supported during the grinding or reseating operation so that the valve seat is accurately ground.

Further objects of the invention are to provide a tool of the character described which can be applied directly to a conventional valve stem, thus eliminating the necessity for a special handle; to utilise the valve stem so that its adjusting threads are screwed into the threads in the valve casing to positively guide and support the reseating tool during the grinding operation; to ol tain a tool which can be easily and quickly applied to a valve stem without alteration or change thereof and interchangeably with the valve washer; to secure a spring pressure upon the reseating element for grinding the valveseat, thus eliminating the necessity of the operator exerting manual pressure on the stem,,and insuring an accurate grinding of the valve seat; to provide adjusting means for the spring so to vary the pressure thereof for various grades of metal in the valve seats or varying amounts of grinding necessary; and to obtain other results and advantages as may be brought out by the following description.

Referring to the accompanying drawing in which like numerals of reference indicate the same parts throughout the several views Figure 1 is a side elevation of a conventional valve or faucet showing my valve reseating tool in an operative position, portions being shown in vertical section.

Fig. 2 is a detached side elevation of the valve reseating tool.

Fig. 3 is a bottom plan view of the milling cutter or grinder.

Corresponding and like parts are referred to in the following description and indicated Specification of Letters Patent.

it to close the valve.

Patented Jan. 25, 1921.

Serial No. scenes.

in all the views of the drawings by the same reference characters.

Q specifically descnblng the invention the numeral 1 designates a conventional. valve caslng provided with the usual threaded end valve washer (not shown) carried by the head 7 of a valve stem 8 is adapted to The valve stem 8 is provided with the usual threads 9 which screw into corresponding threads 10 in the neck 11 of the valve casing 1 to open and close the valve, rotation of the valve stem 8 rais ngcand lowering the valve from and against the valve seat 6. A bonnet 12 is fitted loosely on the valve stem 8 and screws upon the external threads 13 on the neck 11 of the valve casing to close the same, packing (not shown) being arranged between the valve stem and the bonnet to prevent leakage. The outer end of the valve stem 8 is provided with a handle 14 for turningthe stern, while the inner end or head 7 is provided with a centrally disposed threaded hole 15 which receives a screw for securing the before mentioned packing washer on the stem.

My invention includes a screw 16 adapted to fit into the hole 15 after the packing washer and its fastening screw are removed. This screw 16 is provided with a threaded end 17 and an enlarged polygonal shank 18 adjacent the head 19 upon which is slidably mounted a suitable grinding or cutting element 20 of a diameter slightly greater than that of the valve seat 6. This cutting element may. be-of any desired construction, but in the present instance is shown as comprising a circular steel milling disk having radial cutting edges 21 and a centrally disposed polygonal opening 22 adapted to fit loosely on the polygonal shank of the screw 16. The cutting edges 21 are adapted to bear upon the valve seat 6 and are yieldingly held against the same by a coil spring 23 mounted on the screw 16 and interposed between the cutter 20 and an adjusting nut 2 1 mounted on the threaded end 17 of the screw.

When it is desired to grind a valve seat to resent a valve, the valve bonnet 12 is uncutter tooscillate with the valve stem.

screwed and the valve stem removed from the valve casing. The packing washer and its screw are then detached and the screw 16 of my reseating tool screwed into the hole 15, as shown by Fig. 1. The valve stem 8 is then screwed slightly into the valve casing 1 by its threads 9 until the cutter 20 engages the valve seat 6. The valve stem is then retated, preferably a full turn or more, and s cillated back and forth so as to cause the cutting edges 21 to remove some of the metal from the valve seat and smooth the same. In this operation the valve stem screws in and out of the casing 1 and the screw 16 slides through the opening 22 in the cutter, the polygonal formation ofthe shank '18 of the screw and the opening 22 causing the The spring is constantly exerting pressure on the cutter to cause it to cut into the valve seat, and thus the operator does not need to exert any pressure on the valve stem. It is merely necessary to'oscilla'te the valve stem, and inasmuch as the valve stem is screwed into the casing 1 by its own threads the stem is positively and accurately guided and supported so as; to cause an even pressure of the n cutter on the valve, and eliminating the necessity of care on the part of the operator to hold the stem in an accurate position as would be required with a stem having no bearing in the valve casing. The valve seat 6 is thus accurately ground, and the pressure of the spring 23 can be varied as neces sary or desirable by adjustment of nut 2-1 on the threaded end 17 of the screw 16. hitter the valve seat has been sufiiciently ground, the valvestem 8 is removed from the valve casing, the screw 16 removed, and the packing washer replaced with its usual screw. It will be noted that my valve reseating attach ment is removed as an entity, the whole device being carried by the screw 16, the spring and cutter being held thereon by the nut '24 and head 19. r

It will be obvious that when the implement is in operative position, as indicated by Fig. 1,-there will be a constant upward pressure of the spring against the stem of the valve, and this. constant pressure willhold the stem firmly in position so that the valve seat will be accurately ground. It frequently happens that the threads of the valve stem and the threads in the valve casvalve casing and is provided two subscribing witnesses.

the combination with a conventional'valv e' stem which is adapted to be threaded into at end with a washer supporting face and a threaded opening to engage the washer re taining screw, of an elongated screw adapted to be substituted for the washer retaining screw and fitted in the said threaded opening, a valve seat grinding element mounted upon the said screw so that it is slidable thereon but held against rotation, and yield ing means engaging the grinding element to hold it in engagementwith the valve seat.

2. In a device of the character described, the combination with a conventional valve stem adapted to be threaded into a valve casing and provided at its inner end with a washer supporting face and a threaded opening adapted to receive the usual washer retaining screw, of an elongated screw adapted to be substituted for the washer retaining screw and fitted in the threaded opening, a valve seat grinding disk slidably mounted upon the said screw but held against rotation thereon, spring engaging the grinding dislr to hold it yieldably in op retive position, and means for regulating the tension of the spring.

In a device of the character described, the combination of a stem, a adjusting nut threaded thereon, avalve seat grinding element slidably mounted on said stem and adapted to bear against a valveseat, and a spring on said stem interposed between said grinding element and the said adjusting nut.

In testimony whereof I have signed my name to this specification in the presence of J OHN JOSEPH DON Ail-117E. VJitnesses Jnssrn H. DONAI-IUE, HARRY ELDRIDGE.

inner 

